An easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation method

A technology of polyvinylidene fluoride and polyvinylidene fluoride powder, which is applied in the field of easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation, can solve the problems of high cost, poor compatibility, and easy agglomeration, and achieve high The effect of specific surface area, large reserves and low cost

Active Publication Date: 2017-04-12
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the specific surface area of ​​inorganic nanoparticles is large, so they are easy to aggregate together, and the compatibility of hydrophilic inorganic nanoparticles with polymer membrane materials is poor.
Traditional inorganic nanoparticles (Al 2 o 3 ,TiO 2 etc.) are prone to fall off during membrane preparation and use, which affects the performance and modification effect of the membrane
One-dimensional nanomaterials such as carbon nanotubes can improve their stability through the entanglement of polymer chains, but the cost is relatively high

Method used

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  • An easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation method
  • An easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation method
  • An easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation method

Examples

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preparation example Construction

[0032] The raw materials for preparing the ultrafiltration membrane include the following components: polyvinylidene fluoride powder, organic solvent, poly-N-isopropylacrylamide modified attapulgite, additives, and coagulation bath.

[0033] The organic solvent here refers to a solvent capable of dissolving polyvinylidene fluoride powder, such as: N-methyl-2-pyrrolidone, tetrahydrofuran, dimethyl sulfoxide; amides such as dimethylacetamide and dimethylformamide ; Ester solvents such as trimethyl phosphate or triethyl phosphate; Lactone solvents such as γ-butyrolactone; and their mixed solvents.

Embodiment 1

[0047] Example 1 Preparation of polyvinylidene fluoride / modified attapulgite mixed matrix ultrafiltration membrane

[0048] Add 4g of attapulgite modified by silane coupling agent KH-570 into the three-necked flask (see patent document 104128100A for the preparation method), then add 50mL of water, ultrasonically disperse until uniform, and then add the initiator azobisisobutyl Nitrile 0.2g, monomer N-isopropylacrylamide 0.6g, react at 70°C for 12 hours, the reaction product is centrifuged and washed with deionized water and absolute ethanol several times to remove excess reactants, and then vacuum dried Grinding and sieving to obtain attapulgite modified by poly-N-isopropylacrylamide.

[0049] Then respectively add 1%, 4%, 7% (relative to the mass of polyvinylidene fluoride powder) of the modified attapulgite prepared above into 48g of triethyl phosphate, after ultrasonic dispersion is uniform, add 12g of polyvinylidene fluoride Stir and dissolve the vinylidene fluoride powd...

Embodiment 2

[0054] Example 2 Preparation of polyvinylidene fluoride / modified attapulgite mixed matrix ultrafiltration membrane

[0055] Add 4g of silane coupling agent A-150 (vinyltrichlorosilane), A-151 (vinyltriethoxysilane), and KH-570 modified attapulgite in the three-necked flask (for the preparation method, refer to Patent document 104128100A), then add 50mL of water, ultrasonically disperse until uniform, then add in turn 0.3g of initiator azobisisobutyronitrile, 0.5g of monomer N-isopropylacrylamide, react at 75°C for 8 hours, the reaction product After centrifugation, it is washed with deionized water and absolute ethanol several times to remove excess reactants, and then vacuum-dried, ground and sieved to obtain poly-N-isopropylacrylamide-modified attapulgite.

[0056] Then add 4% (relative to the quality of polyvinylidene fluoride powder) of the modified attapulgite prepared above into 42 g of triethyl phosphate, and after ultrasonic dispersion is uniform, add 15 g of polyvinyl...

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Abstract

The invention discloses an easy-to-clean polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. Using triethyl phosphate as solvent, ultrasonically disperse a certain amount of poly-N-isopropylacrylamide-modified attapulgite in it, add polyvinylidene fluoride powder and stir vigorously until dissolved, then add porogen Polyethylene glycol was added and stirred evenly, and finally the casting solution was obtained by standing still for defoaming; water was used as the coagulation bath, and the ultrafiltration membrane was made by immersion precipitation phase inversion method. In the present invention, by introducing the attapulgite modified by poly(N-isopropylacrylamide) into the polyvinylidene fluoride ultrafiltration membrane, the three-dimensional network formed by the unique nanofiber structure of attapulgite and polyvinylidene fluoride can be utilized. shape structure to effectively improve the structure and strength of pure polyvinylidene fluoride ultrafiltration membrane, and use the high hydrophilicity of attapulgite to improve the permeability and hydrophilicity of the membrane. The temperature sensitivity of amide realizes anti-pollution and easy-cleaning properties.

Description

technical field [0001] The invention relates to an easy-to-clean polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof, belonging to the technical field of membrane separation materials. Background technique [0002] Polyvinylidene fluoride (PVDF) has the advantages of good chemical stability, high temperature resistance, oxidation resistance, corrosion resistance, good toughness, high strength, etc. It is one of the preferred membrane materials for preparing ultrafiltration membranes. However, PVDF has extremely low surface energy and strong hydrophobicity, resulting in low water flux after film formation, serious adsorption pollution when separating oil-water or protein-containing solution systems, and rapid flux attenuation, which reduces the service life of the membrane. Moreover, the polluted membrane finally needs to remove pollutants through the dissolution of cleaning reagents. This cleaning process not only consumes chemical reagents, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00C07K1/34
Inventor 薛爱莲周守勇赵宜江蔡健健王蓉张艳李梅生张莉莉褚效中邢卫红
Owner HUAIYIN TEACHERS COLLEGE
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